Final - FINAL EXAMINATION 1. Exons are. a. genes for...

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FINAL EXAMINATION 1. Exons are. .. a. genes for proteins that will be excreted from a cell. b. groups of genes in bacteria that are controlled together. c. extremely important genes. d. separated by introns in many eukaryotic genes. e. removed from an mRNA before the mRNA is exported to the cytoplasm. 2. In one strain of E. coli, a mutation in the gene that codes for the repressor of the lac operon alters the lactose-binding site of the repressor and thus prevents lactose from binding to the protein. In all other ways, the repressor stays the same. Which of the following statements represents a reasonable expectation? a. The strain will never make ß-galactosidase. b. The strain will always make ß-galactosidase. c. The strain will make ß-galactosidase only in the presence of lactose. d. The strain will make ß-galactosidase only in the absence of lactose. e. The strain will make huge amounts of repressor instead of ß-galactosidase. 3. In bacteria, genes for related functions are often found in “operons.” What is the significance of this observation? a. Only genes in operons can ever be used as templates for mRNA synthesis. b. Genes in operons are constitutively transcribed (transcribed all the time). c. All operons are controlled by one repressor protein. d. All genes in all operons are transcribed only in the presence of lactose. e. Two or more genes in one operon are transcribed at the same time and under the same conditions. 4. Many proteins in eukaryotes have a “leader sequence,” a short chain of amino acids that allows them to be inserted into the endoplasmic reticulum. These proteins could wind up. .. a. inside a lysosome. b. as an intrinsic protein in the plasma membrane. c. outside the cell. d. inside the vacuole (assuming a plant or fungal cell). e. any of the above.
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5. In the presence of an inhibitor of microtubule formation, dividing cells will tend to be found in what phase of the cell cycle? a. prophase or prometaphase b. S phase c. anaphase d. G1 phase e. An inhibitor of microtubule formation will not affect the cell cycle of dividing cells, so cells will be found in all phases. 6. What phase of mitosis best describes the cell diagrammed below? a. Prophase b. Prometaphase c. Metaphase d. Anaphase e. Telophase 7. Gametes are best described as. .. a. haploid cells that fuse to form a zygote. b. haploid cells that are always produced by meiosis. c. diploid cells that undergo a series of mitotic divisions to form an adult organism. d. haploid cells that undergo a series of mitotic divisions to form an adult organism. e. male and female diploid cells that fuse at fertilization. 8. Meiosis differs from mitosis in that. .. a. the cells that are produced by mitosis are always diploid.
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This note was uploaded on 12/23/2009 for the course BIS BIS 2A taught by Professor Roth during the Fall '09 term at UC Davis.

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Final - FINAL EXAMINATION 1. Exons are. a. genes for...

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